Method:1. Cut the washed and cleaned fish head into required sizes.2. Mix the finely ground paste ingredients with vinegar to make a smooth paste3. Cook the paste masala in hot oil for 15 minutes on low flame.4. Add the remaining ingredients except the coconut milk and cook further for 5 minutes.5. Add the fish head and 100 ml of water. Cook till the fish heads/pieces are done.6. Now mix in the coconut milk and boil for 5 minutes.7. Serve hot with rice.